SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8996394f7fc23737be413c475cf885dc202588a3ecf61b59a412c18290f15d' 
  AND token = 'T/rCwdZaS/zuikdLz9Hwi5agJc6+YMbo9sNzwpYMGuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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