Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac27e9e5179ddee1a3274494c8f01dfc859d5bd695009a98a1e80a9c48919d1b' 
  AND token = 'YDuYWmweUxYMeFoxGxFa1bGK1PcBzuaCBJ1KNsi49C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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