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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792557bf072fd5a642958b556ed8863d249b9fde906aa9f5fca6ff88fbd255c2' 
  AND token = '8cDji6AQDbpp+rdsfgMtq9U4Hj5NqNCHsQVam1xXttg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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