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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d146a0a7a5b7624df5899a3a964d99c67b3a00c1e444a51ba5fa8635dcc969' 
  AND token = 'v+SnGMboLUDwYw8CbrigeByxkQnnwxFNRIdH89qhkcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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