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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a020d5dceca6c8e1b6de0ab93bdfc392c5086e6b7aff6f7dbd30aaf1c411874f' 
  AND token = 'g3xJFZyFdBWy2mMBVzxIYD5Y1yHmNU0J7IUCufWR0wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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