Can a high voltage rated push-button switch be used on lower voltages?
You have to observe the minimum current and voltage for the switch.

Typically mechanical contacts aren't gold-plated so a thin oxide layer will build up with time and it needs some amount of energy to "burn" that thin layer. See https://en.wikipedia.org/wiki/Wetting_current

A capacitator to generate some inrush current may help but this depends on your setup. If this is a home project and reliability isn't essential just use the switch...