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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f007af0438e0baad418b393a4891fd1d6362a38446895b8e5c0c0ee26ddf099a' 
  AND token = 'xn3J6M/V+tX58cLJCVR4HWsGIlNLxy7FbYuSXDJl19Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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