SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d0825b171bfcb8954397f34e157ec9bd22bc22189daedad64056f14850b0b7' 
  AND token = 'GUAc2kBFJE7zmpWTCSETkVlnWj5kiGB/KNHUlO3FIg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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