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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19611fea280147258f92297ada477c5b10a421af361f7829bd66b368acbc208a' 
  AND token = 'D+IOHi63cTJ0jlO4ZUatqHA3TDkcU3mRyFTeVVN23DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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