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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0030eefcd262068364d079b7343f20b70628a12a5e36e97346bd0eedb1008a3' 
  AND token = 'XGMjF8Ixlz2V5iwXU8iGSfFX249YkRxGKINi34uVmRI=' 
  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