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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83021f7b4d988d578bd6344378075d8048960fc5255f229a3771a53d79e8ea3c' 
  AND token = 'x3oDRq6QHi05VhlUDZNZaYwLNWuT172HS59atzJ0HOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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