SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad19d35a60e0c3fd235f5b483a9edf36e1c001956b74dbd46876a9f7bb5cc8d' 
  AND token = '7yyIF1KCvOjUNC4FBXMOhYuowDZCp6TalQ4/lWMzeio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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