SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db36f900b4c60eb0159fd90be91531361f7c22288f7ad351d2cc8e638b91a5de' 
  AND token = 'Zpg3NvG/u9XtN7AmvzDuuZAjFGfFDIS2JLjEhTJRQ6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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