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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8971a0857d28c87a53a315e61308c6d115d73d07c5cf092361e2099e33a99240' 
  AND token = 'APN6Nr3zwIHOHJWaDQABZTt7YehF1zCe7nMnGLzEG5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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