How to encode 60p MP4 video to play on TVs?
Unfortunately, smart TVs are still a relatively young market and the ability to play back video files is not yet uniform.  Each TV may support or not support a variety of formats, resolutions and frame rates.  Your best bet is likely to stick to formats used by popular services such as youtube and NetFlix as these platforms increase the likelihood that a manufacturer will support that specific format.

Alternately, if you know what model TV you are targeting, you can look at the documentation for the TV for the specific codecs and frameratest that are supported by the TV and pick one of them to match.