SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e3bb06e3f6d60a799eaa8a0bf52cc8ad8bd4e5131f32bc46eb146bbaefd8d2' 
  AND token = 'RQMgLtugp+FI6dKJ3KW0w1XygwjBpYcc2+GU/loz8Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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