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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c9818092db25bc5f05f24e6224dc7551458f6ae5ffcfd505ca4376b2317c8a' 
  AND token = '2F1vZ33Te9lem1czpW9PuRcmHiMZ9tLmVWpMvDWMr3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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