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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f0c6e763294686a6707ab75319150dca66828008f735c9b61d7d3c20ca0ee4' 
  AND token = 'uiNKERdne7SkvN+D03fwdNww8shxe3HN7fvBr16Bl3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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