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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4430d2e7199de565296992441b47300a06954ad170beeed51c67076ec2965c27' 
  AND token = 'hVT9v7IBSW8QPXk4rt7YTPPyqj0xUc0QEpTDOVXdySc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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