Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076bcf4f8a17f7d714183c2fafb392253f4c4b10203faddf4fe41fae9f4760c1' 
  AND token = 'WrPPE9TER3qGx0KVkU1QE9psBzJG1lHYym6YhWuzum0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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