SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acab579f5741f5e8b7903b83b61f71cb3d9f9466ffb4aa2eaef87bdd8cb36b1' 
  AND token = 'qYl20jZHTUgporq35Xgp49+yHHq823Wvz3Q/gP8Ww5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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