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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4439196ff1c4fa546d06d3e12fdaa43efe3776f2ab847b15cde72e34fedc2dae' 
  AND token = 'kzAtD9M1o1z2HWfTz9uJt7IraTfts2Uc+ZSf7SIbX14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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