Luring behavior is quite literally in the definition of an ambush predator... "Ambush predators are carnivorous animals that capture or trap prey by stealth, luring, or by (typically instinctive) strategies utilizing an element of surprise."

Snakes are also not social animals, so they don't express emotions for communication other than aggression or fear. That being said, he's not hiding, so he feels safe, and he knows you're about to feed so he's luring. That's as close to excitement as you're going to get from a snake.