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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5b39a36976b7b3be5eb54cab524ee1aa5cc150469a4bd52438cc4f58f24a20' 
  AND token = 'diszmo/dIjN5A1bQQlsSHC6mCMzvno6MB/Bu0azA5cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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