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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedff7e49ae6b81050c852a14ad20e666c6d06368d9770b8416c8a388a5e6f45' 
  AND token = 'ntO0hOftAai2Dzcs0CY85Cj3RvuzVw0wBqFgJLHLk6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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