SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24c30d60c3d9d05a6a6298e52dc3dcb2789777807a619c47ffe98a19e98245b' 
  AND token = 'DWLllxW20qQgP2eMBGIwuZEz5YluI/hJDY0WJxbV8rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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