SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9f9ae846ccebfd99d7e05194161c14daea196fbf4312899787272bda860a1f' 
  AND token = 'kW9QJ34qPn/fVY/oj5VKpKapnxDsnH63Zqcybyh/gQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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