SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743615877c004b366ba1728709bd55cdabc0f2373b7fbe78a689655b4def8049' 
  AND token = 'pR+Bs8Wnlof2WKPdueU2RyfvHHqb9hBD2gYRI5+FuHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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