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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa20c75fe9363ff3d74cbe7df32367f04f6e46867db45ca3baf6a4d6ddb22b44' 
  AND token = 'KtS/UiRafALqs6o/oop5nhQ9IJZ7WZOz56N5IdDoEMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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