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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3444761af6b8dc07bae821a2263d47d2cefa712b39adf776e3d11773f3d966cf' 
  AND token = 'mzNHl5JJo9XBVNWI6k9TQNQAlgQZg0f+WpvC6BuVT6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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