SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06e198c7a4329d9d3edec31d5b5740d597a2a7d3279de078c63bef2e7815f3f' 
  AND token = 'wYnQUK/hqvbMGj6j24U96RwB40/mvl6l0jH5XJ94B00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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