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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cbb03b6929bbfbe194da8d9e4567f5b199d479c6c60d4681a2a22f65ae752d' 
  AND token = 'sdsSg1dzbWPzoCZxIwHQ1efefkiB86upHLO+VyXQI7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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