SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd002a88e369426da72d5bb1335cbcbb458db90652ea3fd4d3a792865f61784' 
  AND token = '/NtaWDejlrtVkklPAtB/jRj9+v+l8FByYIL1Bh+prn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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