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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0c6275b2c972450fbc2aeb45c1adf1f0d79b442e5b0a1c4e7a9656b7bd3deb' 
  AND token = '+/ONmheLIfHxlA7PnAB5j4hZJrjjkloBPzutwL5/21I=' 
  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