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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789c765b700d7140493c93adb8d22b2a31a20304fac8ddec87c4bef683286e63' 
  AND token = '6cF2tYSfMeDgozvE07mhxm1iwaPC/5MnOTvUbn8QeBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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