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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9adb2af103e6bd6ab324d429317557476b95cd553837a5638abf659ce30fb1' 
  AND token = 'HZTs657uDMd9W8fbAo1OXd8Q8F06FYOo8AB/c6bJirg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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