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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5d699df60b22ba62c27e83d2814681941ce1fd243049d2406a504dafcdc2fe' 
  AND token = 'qgjFn3MF1uX4Izl+qXHoMe7WlsbiOdLUuLnYGTdu2t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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