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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170ea8fdc1a48768ccb4f69a002e786a507920eb68b68f64a99cdf251b61a3ce' 
  AND token = 'vyd1/25xKINc+daPGD8WRFONaLud9qnNrv0ItPZntjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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