SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9219b9a5856048dd9619c7cc458345894570b6720590c329cee258c6ab566db3' 
  AND token = 'BgkZbaPcYUEhSppW/7zJqCLim+ax67OKkIsBcSCufrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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