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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3570f10e208a346bfd3cd5dba8ecf9ddb62fe6d133e3bcdb2751454fa2afcf3' 
  AND token = 'aMVDMpvhugFyPEdO8EdKjADzbf3o5aJfZEHd24e/mkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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