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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bc4df8c89941c872b8b7db481e6ec0f9629fe4072ade10880c464c1df9a657' 
  AND token = '53WSlYHFuQhCunIN+VrMXjvO40wYtyeMsMDGfxry0tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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