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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393de0c187985daf1e64a4b946a857bc95e2b6fa28da136363b694314c656aab' 
  AND token = 'Hl5cqWyqhk4F5bwidphjSuGErgM7Dt17dxL82c8RwJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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