SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fda5161d6529ae7d9c6dc41e237d3c024837e596f5f771f430dd40e5b88a246' 
  AND token = 'xrHq9aZiCqgujHkyKxbXqKseGBLcvsP5sqHpzkMGrdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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