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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31817ad7e403614ba6427d8247f37647a7b33a5f84ad1fb9dcc5564fd3a5e487' 
  AND token = 'KHtqoKHlejw3oxFNQe9ktiwAg6aKkhBHNzkrtSOYnuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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