SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9556feec02f80848d7f2ec80e92c1d1f32c503f787d7117b97545c34bdbbac5' 
  AND token = 'ywS9i/Jm07p2RsqJi5LgmPU5tzgwFzURGpGMblXB/ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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