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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac865ed6e0bf0524904a03af077c267e6d81badc09f2c56fbb6fde571f2bb32b' 
  AND token = '2Tcn+jbSsRn0vnhIm6Z0DC0g9//E/qdtbKLTu8yFlVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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