SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d399d40c10a3ca56b497858dae457d0a4fd7c4c6f558ea9667f5ec71aff1910' 
  AND token = '/PUpY8PKtI6vxLl2wflgDxBDpRM+UF4Jd86QRZK0kIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00163

JSON explain

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