SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096e85828f5fa7e1aa44fafb0094e5a8ab0de2ff7126c80d7ebc672dd6e98133' 
  AND token = '7g0Jw+BMOVN/PRaqGHBM4YS0MMZZLFq3ftlmJ8CVww8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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