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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e66268c98055731a5649d59129be7fca1726b4760d85e1ce715ce1083cc1690' 
  AND token = 'mClRT444kcuY1lskyNux4YavCVr7Jw402HoLOG8LVso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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