SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a74b8e8036793a9c949bc4561d334739d4ce472452220bbf6f374c7acffeeb7' 
  AND token = 'HfAxBGu5z0RNqiD3u/yJnldWBXMevVtOjksWqt8Vmg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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