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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb715c8829498ee27a99767823ffb4a3c1910ccd8800f709e583138dffc69e5f' 
  AND token = 'cD0QS0MZxyFyoB5rBouWT2qUyVsViiNHMsFp3RVj3yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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