SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7d016254e8c9038c465bb283512bff51101a22593470a4764033c33fb24e7d' 
  AND token = 'FT//dj7YvRk4Ku+KDNGIvtseA1u9neygG5pPZWyA7Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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