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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10a2b12f6f742e56288f87ac9f1c7c77576a4bea4e804e857a42d5f3c3f1ea8' 
  AND token = 'sx7UkUOcKz41k2x5mLFmM/7l2+d3+yVc56Lg6cKgxIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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