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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f637c9a5504902db16726f4bd676ed9e7b4349d13f67bb741c40a9ccdafcb6f' 
  AND token = 'SuWj7zQSjWzs03uz5TtkCcP3zB44GECz3evJbT2uIxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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