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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5410d6e3726d3e4268d785fa22c5bef6ca4334b2d0a255019eefb7b9f4acbe' 
  AND token = 'gEZcCGtUYUZJNTeY4MQQN9ejONoBKYXA75vEzidiC5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

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