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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e864a987ab304a72a06efdb8444a08f6c40314bf3a8cdcd4c636fdc96088670f' 
  AND token = '5B5Fg4HUcNsRGDjHDlH0uxUeR4W4JgYLZqnC9kXI0DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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