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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e9770f8f76d1a2c791fa74356b3795c476f2771a65d1ed2d6f95e93d5e13ac' 
  AND token = 'fYv8RIql9OzKQCxp2OrtEgDXOmPBUU1c82EA8xI4PzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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