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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed94b45b5bf77b491191be9e746e1a6dd90863d6f7b5d33cd7ae599655f18dc' 
  AND token = 'LwfDjFNqqOfbHwC8Bd3W8SwImIhcUDRK+Rc79G/av/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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