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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66efc76b50c921dd6ac906873c1ad70ad4cf85a7d9e1c39daf66a0ce27d9dd1' 
  AND token = 'zz/WYf/9d0wVAX266ThWtKvVaA+XeMDCxtq0W736/sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00163

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