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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d9e70582f8ced3c7ff36981a1e11b649e5ef035ff394e0014272df8c5b85c6' 
  AND token = '44QkDl9MhGKDfDiV7TvjJMrYbE+7aOku6Bh7svtx6Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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