Query takes 5 seconds to run .. need to speed it up.

Hi .. I have a table of about 20K rows and am performing this query on Oracle 11g Windows 2003 Server. The query I am running is just below and it takes about 5 seconds per query and i am having to run it on average about 1500 times per 20K rows. A long time. Can it be sped up ? 

Thanks

Jeff

select Name, latitude, longitude from meter_points where abs(latitude - <Static Latitude>) <= .007 and abs(longitude - <Static Longitude>) <= .012 and iscollector = 0  and customerid = 42;

Here is the table structure :

CREATE TABLE meter_points
  (
    NAME        varchar(100),
    Latitude number,
    longitude number,
    iscollector int,
    Customer    varchar(30)     not null,