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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182c68bf6bff728e7232e76d4a6867e77694508114344fef0fbf23502577d7a1' 
  AND token = 'fBpZbTYQh4Tf7nuvoLTX62UH1x8brUYJpNwersue38k=' 
  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