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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786d1e33f092c367d4be483600731195e0637aeaf279e2d9ff1b06366f739458' 
  AND token = 'JTqlA2HpmpkLD9lbdBFVdF0TH4tLKtu17q3dwBXhiVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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