SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b2658420281f46acd95ac488876869f41d6333e51c598b32e6dd64eac11b93' 
  AND token = 'k5XIp5rv9F8HysTZZc+KdvoDy/m9C/SjRwzz+uqCVXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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