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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5d5ce3d78e719131b345dbf2be450cfc07239feb59af72d23143d20d2a3324' 
  AND token = 'QYT51tiwzkRqqussH6goUnLaYSvXA2NA5s9bZcF1lpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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