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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711106caa28c7d9e05716117082b60e0e0d99e1c5a2b54d410fd4cadcd231e39' 
  AND token = '48ASu32nct3n1AVhB5PJEvCU3IqXPEGzXL7ZV6JToUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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