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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d654dac4a42ee95cf173e49a9ca80e94d24ecd4ca55deb71cac14b103b84dd2' 
  AND token = '1LxVpdsdsneVvOj/fh4FXgDI7NuO4ZOXleWWJxX6KLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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