SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbac8cda327c52a4b731c2d1230b044806f08e165000ea179fdf76227098bb77' 
  AND token = 'AQUgFI+3Cjt3WKTORlLv5KZKJJpxA/oQTdnJTPOBr7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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