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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44495b6453484396f7ddb883919eb8a7e1e012ffd69c5f2774ab7cf088003e4' 
  AND token = 'x8FtOstUPGZbdBXPhf6NwIF1ySXugCMeBM3H8ZaORsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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