SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d36303188aecf92fea953f90de591e1a00ddf74410bab3cb385773d7b7f6ff' 
  AND token = 'bKNG1WH7GqQUVdAnAiPYBkKpb5zd0ZtyjvHYVXPL9Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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