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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b7937aeb99d778838a5cf61ad71b4f8e433840e597556f4e22ab834772460b' 
  AND token = '6k1tYxo9NkxeGHDF18juyBauUMF0/yorvVyjzE2DL40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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