SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9668c422616924b8187a2d25507d309631b1b7f5df1f1fef7ccc4434cb191b' 
  AND token = 'KP9DhK3LsHoWuf/qgmG7YTMZKGFnD4pNLhNFArJzdj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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