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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4556f337314c3483adf41dffd946b1f15cb3d0b855489a718648be7ecd3cbd' 
  AND token = 'cc0SkujEHfLb2DRzMk3O1gF2Qw1TKucKwqd45kLGvp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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