SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f061fca573b44c9646c3b895152928d92002486fb832196f8007106cd3c1338e' 
  AND token = 'fudc0+F/fy40zl+mJzO/jWQvPTGIwaKrQg5Hjd4IE80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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