Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce262a56fb9de4fde55b1ea97bb78cd9f0194fa7f33d49f0e7eee1194e01c33d' 
  AND token = 'hSHhrBgFokScMMe5AxR/0nUUm24UC3wveBICRMbE6j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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