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You can use the grib_dump command with the "-D" option:

% grib_dump -D my.index

***** FILE: my.idx 
GRIB File: data/tigge_cf_ecmwf.grib2
GRIB File: data/tigge_af_ecmwf.grib2
Index keys:
key name = mars.date
values = 20070122, 20060630, 20060623, 20060811, 20060619
key name = mars.stream
values = enfo, oper
key name = mars.type
values = cf, fc
key name = mars.step
values = 96, 0
key name = mars.param
values = 228039, 228139, 133, 189, 168, 121, 122, 167, 147, 176, 177, 134, 146, 130, 228164, 136, 228228, 131, 132, 0
key name = mars.levtype
values = sfc, pl, pv, pt
key name = mars.levelist
values = undef, 925, 2, 320
key name = mars.number
values = 0, undef
Index count = 8