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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d0f5171784e81d6e401a24fea956e21a64f5003c84ea99a19be4e638ac851a' 
  AND token = 'P9haEFfCGoyZjBsGirq8Vk5HOLlGHQ2tl6snhcHEQdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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