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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba747d9a2cb615e6991ef5c47cd031730191dc7cb152bd41883b72814ca7874' 
  AND token = 'ggnkZ0WM7ykXwdNHLIbMuctiCrmUzAqAUF7YM4G6mWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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