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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e97f1406107db0fa64d902e7eb319b3686b76249c6fa92f9af5abbec5893e54' 
  AND token = 'P0DhNkihxTinyv7VlUyXSzjNfp6AMXPrUWkojI/6zU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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