SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3855c37850a23b1f25af553347ada83fd941138f6ee642ad5f866eb2dc3dc9' 
  AND token = 'krUUPjshqjmlPQZIeq4zP2z9b8Ve5vSbC8072gJAKwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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