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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ac3c6c5d7832c54d06a460bc4d6988d2cb712b2a787de5c033d1ee5f7836be' 
  AND token = 'VYYNN64M3ZEQV/gS/ZNSh/VL+wGQmslJ2llSSOV62gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables