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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30580c4a956330cbf554e7c16329b36db1d55ea6d887c7b5e35152877ef8107a' 
  AND token = '43fPLk6fiyPH6Ltj6qx9FAiQRzrmHn2xBrAcHtWeXh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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