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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd074108840722e0694c4ca5059334ade48321391345ae2b9bca23860883e6eac' 
  AND token = 'ugqC8KvqbzkeXUGc+cI96Y8MqhfSsvu7LaLWkrsVg/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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