SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c0a7a19e2252b369b8114446d9a2f410f88e644d93a994d0b6f57febbc5865' 
  AND token = 'c+E5/+uyjB9h9qKatGnYz199OQce0AQSFhH+7lE8jmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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