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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2092cc34d7d108166c813eff03facdd83c48a531b0034e2f05062a8242733d' 
  AND token = 'xtNJ5jjxl9EdfV7mBH9jePe7pNhHnZXy1NJfHLTdTZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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