Remember...caresheets are just a guide, not an absolute. Your animal is utilizing that heat because it is trying to reach it's preferred core body temperature, maybe aiding in digestion...in general trying to function regularly. So long as the snake has a place to retreat which maintains a cooler temperature, it shouldn't be a problem.
Just remember...the snake is trying to meet it's functions...there is no right or wrong temperature for them (ok...don't stick them in a freezer.

), they just need to able to properly regulate temps in their given environment.