SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405b68b53f1183a98003d90d5f4caf38ee67ff6f894bd3b4f0cd14925f2b070f' 
  AND token = 'n/Q2S8HGTez9Q9H+ppauBcwWPxf7BFPpglL0vlsjd9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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