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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca4cae2f27ce6d2dfc08e28efdcdfdd1b5f395603dea74e8e515c8a6b4c7c9a' 
  AND token = 'brBzphhNu0A8CMF9Mgzw0YPKk2rGtAgSas/7HNQu3DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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