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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b707f65d332257387d23e27fb7013486486b07d02cce1c3e0bf8951cbf1238b3' 
  AND token = '/rHFnRez8dL0P2dJQc65ivDNEI1P5sPGaVRYG9OFBZ8=' 
  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