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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3515bfcd22639d8db50619109b053549e17e014b52a5e9361bb3b6500765efcc' 
  AND token = 'fkb7DVtHqC+Ym4Utdxq80AnwbHUzCLsPafX67ItSvfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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