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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc034855c318145c40991f01c4a59dae95fd4a28c0c396c6dc64d03ba5edb4a' 
  AND token = '2rhqmO7DPlWsdXoYaWvsvmH6Dnk3wCcMug7u5HUsfU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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