Is my chicken ruined?
I think you should be much more concerned about what happened after you turned on the heating element.

It's likely that a heavy ceramic liner crock pot fresh out of a (properly kept) refrigerator would keep contained food out of the danger zone for a couple hours.  But once cooking begins, that's a wide temperature range to cross - you have to make it from 40 °F to 140 °F within two hours, regardless of the final temperature you reach or how long you hold the food on either end.  At low most crock pots don't put out very much heat, and you had a cold starting temperature for a thick, absorptive cooking vessel, so it may have struggled to bring the chicken up to temperature in sufficient time.

Unfortunately, without having monitored the temperature, there's really no way to know if this would be considered safe by the typical guidelines informed by food safety agencies.  I would consider it suspect at best, but you must make your own decision about whether that's an acceptable risk to you.

However, we tend to lean pretty conservatively about food safety advice around here, because while there are always anecdotes and opinions, much smarter experts than we have set a high bar for safety standards and acceptable risk.  As always: when in doubt, throw it out.