SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dd58e301a72fe6a68c51759b488a7c10918295ed7af420ca7a20bfe96b4fed' 
  AND token = '2mLzieE6/Pv06HVJMVif9CM7Y9Lo8YFTy5O/WjghB9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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