SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf06f7401357f4304273ee4b19fa3b3420d721742355e886c21c22f06554821' 
  AND token = 'bDWLwrYCoRzZxd0l+JYw9MOIDwvli2HMqiI/g2P8o2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}