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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bb06ac7edf8caaecddfb4cb3f5e77eb3e2fc7f5f4ba130677f5f2ab934e55e' 
  AND token = 'kTT+qxriCw//+SAkDgV9QGtJ4Ibv9HHpZx83OkXZjuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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