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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8e9b678bc5aa7b9db616da7c03f7bdf3c2e921c54a9ed572230e91769d3800' 
  AND token = '0EI3V+842p+5HXsM5rjthmL0BAXdF6VJymuxFEkAmC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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