SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05658425fd96df91acdeff4eb7f8f1c6cc64bb5b924fd93d4812b603c170372' 
  AND token = 'jrZ027HoXJmFSRkLPJy7ecquKmss0vqQGQGryYfxeBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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