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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6bc83213a244b6f1dd8db0e7ea7eadcbc4638c98f9ab273dd2dbc4f631df05' 
  AND token = 'HOdYvaRx3CuFzxx+pivpre049Go6lPeg/jqtNAwy/XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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