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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9963a9a672a003fbe294856b6d3431aa6c79501975eb4bae5e7df37bf5a2bb96' 
  AND token = '6A/WVzMz8lRFVAbKaOS0AQRrkPp7LxXqLqYaspx+kDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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