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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c802abddab727488a2a2406286adddf9569addbd9b8704f627d46b7f097228' 
  AND token = 'cyNuwLoV3RvatFXjrjozlFhhhfVS2CoC12sqEkghlec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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