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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da7f5b65f3cc7c36b7f792a61aca42102b8aa3a506107333b7a269d7d62da59' 
  AND token = 'a9z0nH5INO7ej3kw4yduUYFKfUVx/XVmyKOHFJSQppU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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