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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b342c6be9712146b306fb30e06c96ff43fbc721cbffbeb77e0a99074071cb61' 
  AND token = '7hsNNtK6SYTAUxE5gB7UTzvXlvYHZa84//sx0gvoOuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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