SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f34922bc10f6050f7279b68cbda01a3b7bd796aa9dc5897b4f922bc1653587' 
  AND token = 'ZmBZaS8yCc8zUsetjEu1gvjB3vAoM8/jl8ZDKJ7d0Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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