Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd568834c200b61f3681d731671a321f9633774662cd57bba4aacee130074a548' 
  AND token = 'fAIYkjQwWlt01DKOMnST2WEuwQeSORfJxilNqo9Lswg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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