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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31611b5972c695f896c539ea3aa7cad9e999af84bf67361f3e9d7a537501dc10' 
  AND token = 'Skls0sFm+7MV22dGqf1pjvlNNTT7N5iGAaaW+mJfGag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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