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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92348050f126188919f3562a1a487a7cadba7c2cfbc813108dd2f603b77e0643' 
  AND token = 'XIevel+L7DlfJt5EedVbV8l27DaQx9V5hd0J8j2K92s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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