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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013822ec60d80fc4f7fd672a6bc2f71337fc95408a04e209b1aa9d420bf51391' 
  AND token = 'Xf5pPKHzs2hc8t2TKxod7DolW0Ds13KATzA0OMhgNEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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