SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d013a349dae026e58a80db28e7f7cc4850c3f0e96db41169ca837625e3a6185' 
  AND token = '6PKXGhHC9wprzHwj/COPLLM2DmHlL8JN3lU5SSXpqz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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