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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36650755ee253aa98ebadf1f2855f4dda6afd826670dd3cf3b37d6e13190e568' 
  AND token = 'xmfJcELmaIDXdzSv+/mt3cGwtKV3oPmUoqZXvoH+mFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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