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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8a0b59bebcaa1a5e5bd29a6812dcbc55d98c8e8bdfb7ad430db8378cd2adaf' 
  AND token = 'umueVqnKlUPOZAQ+WYD518+TwYRnQT/bTa5UikBCY0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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