SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84072f467638ec0869a7fe2a17e7174002556b11df8ff56574b848be24f7b43' 
  AND token = 'bDSlIVudvHYR9W9y8xQ7DXLQyhS2K3uD/qnWHzznkCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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