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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4917a279c4386f40bf83d1c83af99415537698c38258efb8e9d11151583b8f90' 
  AND token = 'wczuh3WwUgza0R7l2OHR0i9tBrK4JXEA3Rnli15x2rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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