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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eae7d55fd7a5e5bed09c584ea3040910b970311221182306a08e9f7a3c6a939' 
  AND token = 'KcMx+1q+3pJ27cm/WT7ZuC9YSbQ94jdWv5L/yuXB5rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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