SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070505f002b02898bb337e9c52ed559628e4e87f6d36a3533185dca43e811d91' 
  AND token = 'wQZXJQFGbiiP9zjyl6qeWBoK/OCRRov0m7slHgSWFpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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