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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb7332c5de9d08e137681939e35653f101903abfa39e323206ba81a74ef3a30' 
  AND token = 'WlS7LFLNnvWw701NATyogZcilFEWS3dTJeOok8MA5TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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