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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa476903543524a8933a9455c673b2683f529a7587a44ec8b96dec8eb7e3910' 
  AND token = 'D+cUGWoTFSE4VIwQ56ukzUw5+wHvGh5nG35obaLHZuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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