Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f9fea51d6047c46a6286ae01a333d0cbc6c68f908d55142ff96d5accb02abc' 
  AND token = 'NxjveADTwBL7zFSYrAN5xEigW5gsScFHBYfkm6J5Btk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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