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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36f69ac28e0e4ed89b5ca9135864af7da036617b2c15d6f547673e6d6e32367' 
  AND token = 'EFjUuqKy8Ed1elJFgTEqdmutnQLhRmsNAglHoht4Hew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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