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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2831e6ce74f70afc774aa991dd484eb7647ad378c9cdb78aff27073417b86ab1' 
  AND token = 'qC29XX8ARKF5r9nJxVcmWQX9Y6kIJVYnolbdGvgYnto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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