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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e805a40889f1481c4993ef373e9f8577315636a9c1db90f0de05d7f0cfa1c0c' 
  AND token = '/yDvYzRUEbCvQWYS8mBeKP2CMS1FyGmyZtnzk0DLRPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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