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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb0a4cb028c1b70326e5481dc07e4d89fc9fe221c4ace49e3f5e3e13ea535ff' 
  AND token = 'QTicscr/ob2XHqKbUhXCnRXwZQtAPGXz+wO5b7F69ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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